"I recently uploaded a clip with a Swedish young teen driving around in a Swedish police car that the Swedish police wasn't so enthusiastic about. But it was perfectly legal to do so.
Here is a clip of a person driving around in police clothes in a marked police car from Bell county, outside L.A. The car has working light and sirens.
There is a number of american marked police cars on Swedish roads. I have seen a number of them myself. A guy who lives near by has one. It's legal to own and drive here, but it's not legal to drive with light and sirens on a public road. You can have it on your car, just you don't use it."